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Related Party Transactions Dow Intercompany Balances (Details) - Dow [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Jun. 30, 2018
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Related Party Transaction [Line Items] |  |
Accounts Receivable, Related Parties, Current | $ 1 | $ 1
Accounts Payable, Related Parties | $ 110 | $ 138

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